36
DOI:10. 7672/sgjs2017080036
施工技术
CONSTRUCTION TECHNOLOGY
2017年4月下第46卷第8期
水泥土插芯组合桩复合地基工程应用实例研究
宋义仲，程海涛，下发东，李建明（山东省建筑科学研究院，山末济南250031）
【摘要】针对水泥土桩复合地基承载力低、桩身强度低、布桩较密等缺点，开发了水泥土插芯组合桩复合地基。结合聊城某工程实例，对比了复合地基与原设计方案的经济优劣，验算了复合地基的承载力，分析了施工设备与施工参数的合理性，提出了水泥土插芯组合桩施工工艺，针对施工中的技术难点提出了处理措施，对复合地基的应用效果进行了检验。研究表明：水泥土插芯组合桩复合地基相比原设计方案能够节约资金12.7%~14.5%，承载力满足设计要求，且具有一定的安全储备，技术上具有先进性。最后应用效果表明，水泥土插芯组合桩单桩复合地基承
载力、单桩承载力、桩位偏差和桩径均满足设计与规范要求，地基基础是安全的。【关键调】地基；水泥土插芯组合桩；方案对比；应用：研究
【中图分类号】TU447
【文献标识码】A
【文章编号】1002-8498(2017)08-0036-05
CaseStudyonEngineeringApplicationofPileEmbeddedin
CementSoilCompositeFoundation
SONG Yizhong，CHENG Haitao，BUFadong，LI Jianming(Shandong Acodemy of Building Research, Ji'nan,Shandong250031, China)
Abstract:Cement soil pile composite foundation had disadvantages of low bearing capacity, low pile body strength, and small space between piles. In order to overcome the above shortcomings, pile embedded in cement soil composite foundation was developed. Firstly, combined with engineering application in Liaocheng Shandong province, economic analysis between composite foundation and original design scheme were carried out. The bearing capacity of composite foundation was checked then. The rationality of construction equipment and construction parameters were analyzed. The construction technology of pile embedded in cement soil composite foundation was put forward. According to the technical difficulties in construction, the treatment measures were put forward. The application effect of composite foundation was saaeeeeas composite foundation could save money from 12.7% to 14.5%.The bearing capacity of composite foundation satisfied design demand, it was safe and advanced. At last, the application effects show that composite foundation bearing capacity, single pile bearing capacity, offsetting and diameter of pile embedded in cement soil composite foundation could meet the requirements of design and national codes, the foundation was safe.
Key words:foundations; cement soil core composite pile; scheme comparison; application; research
引言 0
复合地基技术以其工艺简单、施工方便、造价低廉等优势，在中小型工程的地基处理中得到了广泛应用"），其推广使用产生了良好的社会效益和经济效益[2]。初期，复合地基主要指碎石桩复合地基，但随着水泥土桩的推广应用，人们逐渐重视水
【作者简介】宋义仲，院长，E-mail:syzsdjky@sina.com
【收稿日期】2016-06-27 万方数据
泥土桩复合地基的研究[34]。但水泥土桩复合地基存在承载力低、桩身强度低、布桩较密等缺点，因此需要发展一种新桩型来克服上述缺点。
水泥土插芯组合桩是一种芯桩与水泥土共同工作、承受荷载的复合材料新桩型，既能有效提高地基土的承载力，减小沉降，又能充分发挥材料本身的强度，是一种经济有效的地基处理方法[56]。水泥土插芯组合桩是一种刚性桩，能够通过调整